Connection with multiple nodes

[oprincipe]

@oprincipe

Hi, I add to your collection class the parameter withContactPoints necessary to connect
the client to a node into a cluster with multiple nodes.
This is the code, hoping this will help you with your package.

File: Connection.php
Row: 97
$cluster = Cassandra::cluster()->withContactPoints($config['host'])->build();

Regards,
Principe Orazio